如何在mysql和php中检查早于某个日期的账号？

SELECT * FROM users WHERE created_at < '2022-01-01';

<?php
// 连接到MySQL数据库
$servername = "localhost";
$username = "your_username";
$password = "your_password";
$dbname = "your_database";

$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接是否成功
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 构建SQL查询语句
$sql = "SELECT * FROM users WHERE created_at < '2022-01-01'";

// 执行查询
$result = $conn->query($sql);

// 处理查询结果
if ($result->num_rows > 0) {
    // 输出每个账号的信息
    while ($row = $result->fetch_assoc()) {
        echo "账号ID: " . $row["id"] . "<br>";
        echo "账号名称: " . $row["username"] . "<br>";
        // 其他字段...
        echo "<br>";
    }
} else {
    echo "没有找到早于指定日期的账号。";
}

// 关闭数据库连接
$conn->close();
?>